Maybe it was sacred knowledge. You could have been killed just for saying God's name in some places. There were a lot of ways you could be killed if you weren't careful, they needed to hide these secrets sometimes it seems. The kings of the time didn't want their people knowing too much, sorta like how the elite of this day and age don't want us knowing too much.
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King Herod sought out to killed jesus as a baby. The pharisees talked about ways to kill him. And in the end, Jesus was crucified. So, even if was using plants to heal, he was still a very controversial figure. The message he was teaching was already disruptive to some of the powers or elites, and they already wanted to kill him. So I don't think Jesus would have needed to hide using plants, because he'd have died either way.